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@ 2019-09-17T07:25:57Z

<?php

$a = Array
(
    '0' => Array
        (
            'id' => 1,
            'color' => 'red'

        ),

    '1' => Array
        (
            '0' => Array
                (
                    'id' => 2,
                    'color' => 'blue'
                ),

            '1' => Array
                (
                    '0' => Array
                        (
                            'id' => 3,
                            'color' => 'green'
                        )

                ),

            '2' => Array
                (
                    'id' => 4,
                    'color' => 'blue'
                )

        ),

    '2' => Array
        (
            'id' => 5,
            'color' => 'purple'
        )

);
$i = 0;
array_walk_recursive($a, function($v,$k)use(&$r,&$i){
	$r[$i][$k] = $v;
	($k == 'color') ? $i++ :$i; 
});
echo '<pre>';
print_r($r);

Output for git.master, git.master_jit, rfc.property-hooks: <pre>Array ( [0] => Array ( [id] => 1 [color] => red ) [1] => Array ( [id] => 2 [color] => blue ) [2] => Array ( [id] => 3 [color] => green ) [3] => Array ( [id] => 4 [color] => blue ) [4] => Array ( [id] => 5 [color] => purple ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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